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| Titel |
Atmospheric Conservation Properties in ECMWF Reanalyses |
| VerfasserIn |
P. Berrisford, P. Kållberg, S. Kobayashi, A. Simmons, S. Uppala, D. Dee, P. Poli |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250026396
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| Zusammenfassung |
| Variables that measure the gross properties of the atmosphere and are governed
by simple physical constraints are useful in assessing the quality of
atmospheric datasets such as reanalyses. Even though such global diagnostics
do not give a detailed view of every point on the globe they do give an
overview of the whole globe and are useful in providing an initial assessment
of a dataset. Here, the atmospheric budgets of mass, energy and angular momentum
and the hydrological cycle are investigated using monthly mean data from the
ECMWF Interim Reanalysis (ERA-Interim) and compared with those from ERA-40. On
the whole it is found that the physical constraints are more closely adhered to
in ERA-Interim than in ERA-40. Furthermore, the adherences, as measured by the
constancy of quasi-conserved variables or budget closure, vary in time. Where
possible an attempt is made to relate these temporal variations to changes in
the observing system. |
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